Gastroscopy.
D000006:Abdomen, Acute / Q000175:diagnosis; D001466:Barium Sulfate; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis; D005773:Gastroscopy; D006801:Humans; D007417:Intestinal Polyps / Q000175:diagnosis; D011182:Postoperative Care; D011859:Radiography; D013272:Stomach Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D013276:Stomach Ulcer / Q000175:diagnosis
D001466:Barium Sulfate